CN111588518B

CN111588518B - Hip joint prosthesis

Info

Publication number: CN111588518B
Application number: CN202010405925.XA
Authority: CN
Inventors: 王秀芳
Original assignee: Tianyan Medical Equipment Co ltd
Current assignee: Tianyan Medical Equipment Co ltd
Priority date: 2020-05-14
Filing date: 2020-05-14
Publication date: 2021-07-27
Anticipated expiration: 2040-05-14
Also published as: CN111588518A

Abstract

The invention discloses a hip joint prosthesis which comprises an acetabulum outer cup, an acetabulum inner liner and a ball head, wherein a thickening sleeve is arranged on the outer side of the acetabulum outer cup, the acetabulum inner liner is positioned inside the acetabulum outer cup, the ball head is positioned inside the acetabulum inner liner, a plurality of hemispherical grooves are formed in the lower end of the ball head, which is in contact with the acetabulum inner liner, balls are arranged in the hemispherical grooves, the balls are in contact with the inner wall of the acetabulum inner liner, a plurality of petal bulges are arranged on the periphery of the upper end of the outer wall of the acetabulum inner liner, strip bulges are arranged at the lower ends of the petal bulges, special-shaped square holes are arranged at the positions, corresponding to the side walls of the acetabulum outer cup and the strip bulges, square holes are arranged at the positions, corresponding to the special-shaped square holes, and special-shaped movable blocks are arranged in the special-shaped square holes and the square holes. The hip joint prosthesis disclosed by the invention reduces the friction between the acetabulum lining and the ball head, can be used for pre-fixing the acetabulum outer cup when the acetabulum outer cup is installed, and reduces the risk of installation failure.

Description

Hip joint prosthesis

Technical Field

The invention relates to the field of hip joint replacement, in particular to a hip joint prosthesis.

Background

The hip joint of a human body consists of a femoral head and an acetabulum socket, is a typical acetabulum joint, is positioned at the root of a thigh of the human body and is an important joint part of the human body, and the femoral head necrosis is a disease which seriously affects the activity of the hip joint, so that a patient can not walk and can only rest in bed, and at this time, a hip joint replacement operation needs to be carried out, namely, a hip joint prosthesis replaces the hip joint of the human body to replace the activity of the hip joint, and the existing hip joint replacement operation is developed for over one hundred years and is quite mature, so that a plurality of femoral head necrosis patients are benefited. However, the existing hip joint replacement surgery has some defects, one of the most concerned problems in the industry is the problem that the wear of the acetabular lining generates particles, the existing acetabular lining is mostly made of ultra-high molecular polyethylene material, most of the movement friction after the prosthesis is installed occurs between the ball head and the acetabular lining, the wear rate of the metal ball head is extremely low, about 0.00400/year, the wear rate of polyethylene is 0.1 mm/year, and the particles generated by the polyethylene wear can cause a series of case reactions such as synovitis, joint instability, osteolysis and prosthesis loosening; secondly, in the process of hip joint replacement surgery, in the prior art, the acetabulum outer cup is placed in a human acetabulum socket, and then is fixed on the human acetabulum socket by screws, the acetabulum outer cup is easy to deflect in the process, so that the acetabulum outer cup cannot be accurately installed, if the acetabulum outer cup is installed in a staggered way, holes are required to be drilled again for installation, and the pain of a patient is increased while the surgical risk is increased; thirdly, in the operation process, in order to match the acetabulum socket and the acetabulum outer cup, the acetabulum socket needs to be polished into a spherical shape suitable for the acetabulum outer cup by a file, the natural shape of the human acetabulum socket is that the side wall is thicker, the bottom is thinner, the force of press fit between the acetabulum socket and the acetabulum outer cup is gradually reduced from the side wall to the bottom, and the press fit force of the acetabulum socket and the acetabulum outer cup in the prior art can cause the problems that the bone compression amount at the bottom of the acetabulum socket is too large and the compression amount of the side wall is too small.

Disclosure of Invention

The object of the present invention is to provide a hip prosthesis that solves the problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a hip joint prosthesis comprises an acetabulum outer cup, an acetabulum inner liner and a ball head, wherein the acetabulum outer cup is a hemisphere and is used for being placed in an acetabulum socket of a human body, the acetabulum outer cup is the same as a traditional acetabulum outer cup, the acetabulum inner liner is a hemisphere and is made of an ultrahigh molecular polyethylene material, the ball head is an irregular sphere and is made of the same material as the traditional ball head, a thickening sleeve is arranged on the outer side of the acetabulum outer cup, the thickening sleeve is a hemisphere annular structure, the lower end of the thickening sleeve is open, the acetabulum inner liner is positioned in the acetabulum outer cup, the ball head is positioned in the acetabulum inner liner, a plurality of hemisphere grooves are arranged at the lower end of the ball head, which is in contact with the acetabulum inner liner, four hemisphere grooves are arranged on the same horizontal plane, the diameters of the hemisphere grooves are the same, balls are arranged in the hemisphere grooves, and the diameters of the balls on the same horizontal plane are the same, the ball is contacted with the inner wall of the acetabulum lining, the lower end of the ball head is not a regular sphere, a space is formed between the ball head and the inner wall of the lower end of the acetabulum lining, the space ensures that the lower end of the ball head is not contacted with the acetabulum lining and ensures that the ball is contacted with the acetabulum lining, the sliding motion between the ball head and the acetabulum lining is changed into the rolling motion between the ball head and the acetabulum lining, the friction coefficient is reduced, the wear rate of the acetabulum lining is reduced, the morbidity is reduced, the service life is prolonged, a plurality of petal bulges are arranged on the periphery of the upper end of the outer wall of the acetabulum lining, the petal bulges are quarter spheres and are used for press-fitting the acetabulum lining and the acetabulum outer cup, the lower ends of the petal bulges are provided with strip bulges which are in seamless contact with the petal bulges, the strip bulges are arranged on the periphery of the upper end of the outer wall of the acetabulum lining and are used for applying pressure to the special-shaped movable block, the special-shaped square hole is formed in the position, corresponding to the strip-shaped protrusion, of the side wall of the acetabular outer cup, the special-shaped square hole is a cuboid with a square end face, the square hole is formed in the position, corresponding to the special-shaped square hole, of the side wall of the thickening sleeve, the end face of the square hole is consistent with the end face of the special-shaped square hole, special-shaped movable blocks are arranged in the special-shaped square hole and the square hole, certain friction force is achieved between the special-shaped movable blocks and the special-shaped square hole and between the special-shaped movable blocks and the square hole, the special-shaped movable blocks cannot be pressed out before the installation of the acetabular outer cup, and when the acetabular lining is pressed into the acetabular outer cup, the special-shaped movable blocks are pressed out.

Preferably, seamless contact is formed between the upper end of the side wall of the ball head and the acetabulum lining, so that slippage between the ball head and the acetabulum lining is prevented, a gap is formed between the lower end and the bottom of the side wall of the ball head and the acetabulum lining, the gap enables the lower end and the bottom of the side wall of the ball head and the acetabulum lining to be not contacted, friction is reduced, the gap between the ball head and the acetabulum lining is sequentially enlarged from the side wall to the bottom, the hemispherical groove is sequentially enlarged from the side wall to the bottom of the ball head, the balls are sequentially enlarged from the side wall to the bottom of the ball head, the balls can roll in the hemispherical groove in a universal manner, and the balls are in seamless contact with the inner wall of the acetabulum lining.

Preferably, the positions of the acetabulum outer cup corresponding to the petal bulges are provided with a plurality of petal grooves, the petal grooves and the petal bulges are just clamped, the lower ends of the strip bulges are provided with a first arc surface, the first arc line surface is used for applying pressure to the special-shaped movable block, one end of the special-shaped movable block, which is contacted with the strip-shaped bulge, is a second arc line surface and a third arc line surface, when the acetabulum liner is pressed down to enter the acetabulum outer cup, the strip-shaped bulges are pressed down at the same time, so that the first arc line surface meets the third arc line surface firstly and then meets the second arc line surface, the direction of the cambered surfaces of the first cambered surface and the second cambered surface is the same, when the first cambered surface and the second cambered surface meet, the acetabulum lining is completely pressed into the acetabulum outer cup, the special-shaped movable block is pressed out, the direction of the cambered surfaces of the first cambered surface and the third cambered surface is opposite, so that the strip-shaped protrusions can be conveniently and smoothly pressed down to enable the special-shaped movable block to be pressed out.

Preferably, the middle end of the special-shaped movable block is provided with a first annular groove and a first annular protrusion, a second annular protrusion is arranged in a position corresponding to the first annular groove in the special-shaped square hole, a second annular groove is arranged in a position corresponding to the first annular protrusion in the special-shaped square hole, when the acetabulum liner is completely pressed and pressed into the acetabulum outer cup, the special-shaped movable block is pressed out, the first annular groove and the second annular protrusion are completely clamped, the first annular protrusion and the second annular groove are completely clamped, and the special-shaped movable block is fixed.

Preferably, one end of the special-shaped movable block, which is far away from the second arc line surface and the third arc line surface, is provided with a pointed cone, the acetabulum outer cup is fixed on an acetabulum socket of a human body by screws in a hip joint replacement operation, the acetabulum outer cup is easy to deflect in the process, so that the acetabulum outer cup cannot be accurately installed, when an acetabulum liner is completely pressed and fitted into the acetabulum outer cup, the special-shaped movable block is pressed out, the pointed cone is pressed and fitted into bone substances of the acetabulum socket, and the pointed cone is used for initially stabilizing the position of the acetabulum outer cup before the screws are fixed, so that the installation offset of the acetabulum outer cup is prevented.

Preferably, a plurality of grooves are formed in the periphery of the inner wall of the thickening sleeve, a plurality of wall protrusions are arranged at positions, corresponding to the grooves, of the outer acetabular cup and the wall protrusions, the grooves and the wall protrusions are clamped with each other, so that the thickening sleeve is fixed on the outer acetabular cup, the thickness of the thickening sleeve can be changed according to the shape of the acetabular socket of a patient, the thicknesses of the thickening sleeve, the grooves and the wall protrusions are gradually thinned along the side wall to the bottom of the outer acetabular cup, the natural shape of the acetabular socket of the human body is thicker, the bottom of the acetabular socket of the human body is thinner, the shapes of the thickening sleeve, the grooves and the wall protrusions can adapt to the shape of the acetabular socket of the human body, the force of press fit between the acetabular socket and the outer acetabular cup is gradually reduced from the side wall to the bottom of the acetabular socket, and the shapes of the grooves and the wall protrusions are adaptive.

Preferably, the thickening sleeve is contacted with the side wall of the acetabulum outer cup, and the thickening sleeve is not contacted with the bottom of the acetabulum outer cup, so that the shape of an acetabulum socket of a human body is met.

Preferably, the acetabulum outer cup, the acetabulum inner liner and the side wall of the thickening sleeve are provided with fixing holes, and screws are driven into the fixing holes, so that the acetabulum outer cup, the acetabulum inner liner and the side wall of the thickening sleeve are fixed in the acetabulum socket.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the balls with different sizes are arranged at the bottom of the contact part of the ball head and the acetabulum lining in a press fit manner, so that the contact area between the ball head and the acetabulum lining is reduced, the motion mode between the ball head and the acetabulum lining is changed from the traditional sliding friction into the rolling friction, the friction force between the ball head and the acetabulum lining is reduced, particles generated by the acetabulum lining through friction are reduced, and a series of case reactions such as synovitis, joint instability, osteolysis and prosthesis loosening caused by polyethylene abrasion are effectively slowed or avoided;

2. the special-shaped movable block is arranged on the acetabulum outer cup, so that when the acetabulum inner liner is pressed into the acetabulum outer cup, the acetabulum outer cup and the acetabulum socket have relative fixing function, when the screw is driven in, the screw is not easy to be askew, the acetabulum outer cup is not easy to be installed and deflected under the action force of the screw, and the operation difficulty is reduced.

3. The thickened sleeve is arranged on the outer side of the acetabulum outer cup, so that the press fit force of the contacted side wall of the acetabulum outer cup and the acetabulum socket is larger, the press fit force of the contacted bottom of the acetabulum outer cup and the acetabulum socket is reduced, even approaches to zero pressure contact, and the structure of the acetabulum socket of a human body is met.

Drawings

FIG. 1 is a top view of a hip prosthesis according to the invention;

FIG. 2 is a cross-sectional view taken along line A-A of a hip prosthesis according to the invention;

FIG. 3 is a cross-sectional view taken at B-B of a hip prosthesis according to the invention;

FIG. 4 is a front view of a ball end of a hip prosthesis according to the invention;

FIG. 5 is a cross-sectional view taken at C-C of a hip joint prosthesis ball head of the present invention;

FIG. 6 is a cross-sectional view taken at D-D of a hip joint prosthesis ball head according to the present invention;

FIG. 7 is a cross-sectional view taken at E-E of a hip prosthesis ball head of the present invention;

FIG. 8 is a cross-sectional view of a hip prosthesis acetabular liner of the invention;

FIG. 9 is a cross-sectional view of a hip prosthesis acetabular outer cup of the invention;

FIG. 10 is a cross-sectional view of a hip prosthesis profile segment in accordance with the present invention;

FIG. 11 is a perspective view of a hip prosthesis tip cone of the present invention;

FIG. 12 is a cross-sectional view of a hip prosthesis thickening sleeve of the present invention;

FIG. 13 is a schematic structural view of a hip joint prosthesis acetabular outer cup of the invention before installation;

FIG. 14 is a schematic structural view of the hip prosthesis after the installation of the special-shaped movable block.

Reference numerals: 1. an acetabular outer cup; 2. an acetabular liner; 3. a ball head; 4. thickening the sleeve; 5. a hemispherical groove; 6. a ball bearing; 7. the petals are convex; 8. strip-shaped bulges; 9. a special-shaped square hole; 10. a square hole; 11. a special-shaped movable block; 12. a first arc surface; 13. a second arc surface; 14. a third arc surface; 15. a first annular groove; 16. a first annular projection; 17. a second annular bulge; 18. a second annular groove; 19. a pointed cone; 20. grooving; 21. the wall is convex; 22. a fixing hole; 23. a hypothesis line; 24. petal grooves.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): referring to fig. 1 to 14, in the present invention, a hip joint prosthesis comprises an acetabular outer cup 1, an acetabular inner liner 2, and a ball head 3, wherein the acetabular outer cup 1 is a hemisphere for placing in an acetabular socket of a human body, and is the same as a conventional acetabular outer cup, the acetabular inner liner 2 is a hemisphere, and is the same as a conventional acetabular inner liner, and is made of an ultra-high molecular polyethylene material, the ball head 3 is an irregular sphere, and is the same as a conventional ball head, and the ball head 3 has a shape shown in fig. 4, wherein a line 23 is assumed to be absent, a line 23 is assumed to be a line of a regular sphere, a lower end of the ball head 3 is an ellipsoid, a thickening sleeve 4 is disposed on an outer side of the acetabular outer cup 1, the thickening sleeve 4 is a hemispherical ring structure, and has an opening at a lower end, that is shown in fig. 12, the acetabular inner liner 2 is located inside the acetabular outer cup 1, the ball head 3 is located inside the acetabular inner liner 2, and a plurality of hemispherical grooves 5 are disposed at a lower end where the ball head 3 contacts the acetabular inner liner 2, as shown in fig. 5, 6 and 7, four hemispherical grooves 5 are arranged on the same horizontal plane, the diameters of the hemispherical grooves 5 on the same horizontal plane are the same, balls 6 are arranged in the hemispherical grooves 5, the diameters of the balls 6 on the same horizontal plane are the same, the balls 6 are contacted with the inner wall of the acetabulum lining 2, as shown in fig. 2 and 3, the lower end of a ball head 3 is not a regular ball, and a space is formed between the lower end of the ball head 3 and the inner wall of the lower end of the acetabulum lining 2, so that the lower end of the ball head 3 is not contacted with the acetabulum lining 2, the balls 6 are contacted with the acetabulum lining 2, the sliding motion between the ball head 3 and the acetabulum lining 2 is changed into the rolling motion between the balls 6 and the acetabulum lining 2, the friction coefficient is reduced, the wear rate of the acetabulum lining 2 is reduced, the morbidity is reduced, the service life is increased, a plurality of petal bulges 7 are arranged on the circumference of the upper end of the outer wall of the acetabulum lining 2, the petal bulges 7 are one fourth of a ball, is used for press-fitting the acetabulum inner liner 2 and the acetabulum outer cup 1, the lower end of the petal bulge 7 is provided with a strip-shaped bulge 8, the strip-shaped bulge 8 is arranged on the upper end of the outer wall of the acetabulum inner liner 2 for a circle, the special-shaped movable block 11 is used for providing pressure to the special-shaped movable block, the special-shaped square hole 9 is arranged at the position, corresponding to the strip-shaped bulge 8, of the side wall of the acetabulum outer cup 1, the special-shaped square hole 9 is a cuboid with a square end face, the square hole 10 is arranged at the position, corresponding to the special-shaped square hole 9, of the side wall of the thickening sleeve 4, the end face of the square hole 10 is consistent with the end face of the special-shaped square hole 9, the special-shaped movable block 11 is arranged in the special-shaped square hole 9 and the square hole 10, a certain friction force is formed among the special-shaped movable block 11, the special-shaped square hole 9 and the square hole 10, and the special-shaped movable block cannot be pressed out before the acetabulum outer cup 1 is installed, i.e., fig. 13, the contoured movable block 11 is pressed out when the acetabular liner 2 is press fit into the acetabular cup, i.e., fig. 14.

Seamless contact is between the lateral wall upper end of bulb 3 and acetabular bone inside lining 2, be f section bulb 3 and acetabular bone inside lining 2 seamless contact in fig. 3, prevent slippage between bulb 3 and acetabular bone inside lining 2, there is the space between the lateral wall lower extreme and the bottom of bulb 3 and acetabular bone inside lining 2, this space makes contactless between the lateral wall lower extreme and the bottom of bulb 3 and acetabular bone inside lining 2, reduce the friction, the gap between bulb 3 and acetabular bone inside lining 2 is grow from the lateral wall to the bottom in proper order, hemisphere recess 5 is grow from the lateral wall of bulb 3 to the bottom in proper order, ball 6 can universal roll in hemisphere recess 5, hemisphere recess 5 and ball 6 radiuses on the same horizontal cross-section of bulb 3 equal.

The positions of the acetabulum outer cup 1 corresponding to the petal bulges 7 are provided with a plurality of petal grooves 24, the petal grooves 24 and the petal bulges 7 are just clamped and matched, as shown in figure 8, the lower end of the strip bulges 8 is provided with a first arc line surface 12, the first arc line surface 12 is used for providing pressure for the special-shaped movable block 11, as shown in figure 10, one end of the special-shaped movable block 11, which is contacted with the strip bulges 8, is provided with a second arc line surface 13 and a third arc line surface 14, when the acetabulum inner liner 2 is pressed down into the acetabulum outer cup 1, the strip bulges 8 are pressed down simultaneously, so that the first arc line surface 12 meets the third arc line surface 14 firstly and then meets the second arc line surface 13, the directions of the arc lines of the first arc line surface 12 and the second arc line surface 13 are the same, when the first arc line surface 12 and the second arc line surface are pressed and met, the acetabulum 3 completely enters the acetabulum outer cup 1, the movable block 11 is pressed out, the directions of the, the strip-shaped bulge 8 is conveniently pressed down smoothly, so that the special-shaped movable block 11 is pressed out.

As shown in fig. 9 and 10, a first annular groove 15 and a first annular protrusion 16 are arranged at the middle end of the special-shaped movable block 11, a second annular protrusion 17 is arranged in the special-shaped square hole 9 and at a position corresponding to the first annular groove 15, a second annular groove 18 is arranged at a position corresponding to the special-shaped square hole 9 and the first annular protrusion 16, when the acetabular liner 2 is completely press-fitted into the acetabular cup 1, the special-shaped movable block 11 is pressed out, the first annular groove 15 and the second annular protrusion 17 are completely clamped, the first annular protrusion 16 and the second annular groove 18 are completely clamped, and the special-shaped movable block 11 is fixed.

As shown in figure 10, one end of the special-shaped movable block 11, which is far away from the second arc line surface 13 and the third arc line surface 14, is provided with a pointed cone 19, the shape of the pointed cone 19 is shown in figure 11, in the hip replacement surgery, the acetabulum outer cup 1 is fixed on an acetabulum fossa of a human body by using screws, the acetabulum outer cup 1 is easy to deflect in the process, so that the acetabulum outer cup 1 cannot be accurately installed, when the acetabulum inner liner 2 is completely pressed into the acetabulum outer cup 1, the special-shaped movable block 11 is pressed out, the pointed cone 19 is pressed into bone substances in the acetabulum fossa, and the pointed cone 19 is used for initially stabilizing the position of the acetabulum outer cup 1 before the screws are fixed, so as to prevent the aceta.

A plurality of grooves 20 are formed in the periphery of the inner wall of the thickening sleeve 4, a plurality of wall protrusions 21 are arranged at positions corresponding to the acetabulum outer cup 1 and the grooves 20, the grooves 20 and the wall protrusions 21 are clamped with each other, the thickening sleeve 4 is fixed on the acetabulum outer cup 1, the thickness of the thickening sleeve 4 can be changed according to the shape of an acetabulum socket of a patient, the thickening sleeve 4 and the thickness of the wall protrusions 21 are gradually thinned along the side wall to the bottom of the acetabulum outer cup 1, the natural shape of the acetabulum socket of a human body is that the side wall is thicker, the bottom is thinner, the shapes of the thickening sleeve 4, the grooves 20 and the wall protrusions 21 can adapt to the shape of the acetabulum socket of the human body, the force path for press fit between the acetabulum socket and the acetabulum outer cup 1 is gradually reduced from the side wall to the bottom, and the grooves 20 and the wall protrusions 21 are matched in shape.

The thickening sleeve 4 is contacted with the side wall of the acetabulum outer cup 1, and the thickening sleeve 4 is not contacted with the bottom of the acetabulum outer cup 1, so that the shape of an acetabulum socket of a human body is met.

The outer cup 1 of acetabular bone, be provided with fixed orifices 22 on acetabular bone inside lining 2 and the 4 lateral walls of thickening cover, be used for driving into the screw in the fixed orifices 22, as shown in fig. 3, the one end opening that fixed orifices 22 are close to acetabular bone inside lining 2 inner wall is great, the screw head can the joint here, in order to guarantee the stability of outer cup 1 of acetabular bone, in addition, the shape of screw head and the shape of the inner wall of acetabular bone inside lining 2 coincide, when ball 6 moved fixed orifices 22, the screw head can give ball 6 holding power, can not lead to ball 6 not having the power point when moving fixed orifices 22, the problem that ball 6 card caused bulb 3 not smooth operation in fixed orifices 22 has also been avoided, make outer cup 1 of acetabular bone inside lining 2 of acetabular bone and the 4 lateral walls of thickening cover be fixed in the acetabular bone nest.

The working principle of the invention is as follows: in the hip joint replacement operation, firstly twisting the acetabulum fossa of a human body into a suitable shape by a file, then fixing the acetabulum outer cup 1 and the thickening sleeve 4, placing the acetabulum outer cup in the acetabulum fossa, then pressing the acetabulum inner liner 2 into the acetabulum outer cup 1 to ensure that the petal bulges 7 are matched with the petal grooves 2, wherein the first arc line surface 12 meets the third arc line surface 14 and then meets the second arc line surface 13 in the pressing-down process of the strip bulges 8, when the acetabulum inner liner 2 completely enters the acetabulum outer cup 1, namely the first arc line surface 12 meets the second arc line surface 13, the first annular groove 15 and the second annular bulge 17 on the special-shaped movable block 11 are pressed tightly, the first annular bulge 16 and the second annular groove 18 are pressed tightly, the pointed cone 19 is pressed out of the special-shaped square hole 9 and the square hole 10 and is fixed on the acetabulum fossa, a screw is driven into the fixing hole 22, so that the acetabulum outer cup 1, the acetabulum inner liner 2 and the thickening sleeve 4 are completely fixed on the acetabulum fossa, then the ball head 3 is pressed into the acetabulum lining 2, when the ball 6 meets the inner wall of the acetabulum lining 2, the ball head 3 is completely pressed, and when the ball head 3 moves with the acetabulum lining 2, the ball 6 reduces the friction force between the two.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A hip joint prosthesis comprises an acetabulum outer cup (1), an acetabulum inner liner (2) and a ball head (3), and is characterized in that: the outer side of the acetabulum outer cup (1) is provided with a thickened sleeve (4), the acetabulum inner liner (2) is positioned inside the acetabulum outer cup (1), the ball head (3) is positioned in the acetabulum lining (2), a plurality of hemispherical grooves (5) are arranged at the lower end of the ball head (3) which is contacted with the acetabulum lining (2), the ball bearing (6) is arranged in the hemispherical groove (5), the ball bearing (6) is contacted with the inner wall of the acetabulum liner (2), a plurality of petal bulges (7) are arranged on the periphery of the upper end of the outer wall of the acetabulum inner liner (2), the lower end of the petal bulge (7) is provided with a strip-shaped bulge (8), the side wall of the acetabulum outer cup (1) and the position corresponding to the strip-shaped bulge (8) are provided with a special-shaped square hole (9), a square hole (10) is arranged on the side wall of the thickening sleeve (4) corresponding to the special-shaped square hole (9), special-shaped movable blocks (11) are arranged in the special-shaped square holes (9) and the square holes (10);

the upper end of the side wall of the ball head (3) is in seamless contact with the acetabulum lining (2), a gap is reserved between the lower end and the bottom of the side wall of the ball head (3) and the acetabulum lining (2), the gap between the ball head (3) and the acetabulum lining (2) increases from the side wall to the bottom, the hemispherical groove (5) increases from the side wall to the bottom of the ball head (3), the balls (6) increase from the side wall to the bottom of the ball head (3), and the radiuses of the hemispherical groove (5) and the balls (6) on the same horizontal section of the ball head (3) are equal;

the thickening sleeve (4) is contacted with the side wall of the acetabulum outer cup (1), and the thickening sleeve (4) is not contacted with the bottom of the acetabulum outer cup (1).

2. A hip joint prosthesis according to claim 1, wherein: the acetabulum outer cup (1) is provided with a plurality of petal recess (24) with the protruding (7) corresponding position of petal, strip protruding (8) lower extreme is No. one arc line face (12), the one end of special-shaped movable block (11) and the protruding (8) contact of strip is No. two arc line faces (13) and No. three arc line faces (14), the cambered surface direction of No. one arc line face (12) and No. two arc line faces (13) is the same, the cambered surface opposite direction of No. one arc line face (12) and No. three arc line faces (14).

3. A hip joint prosthesis according to claim 1, wherein: the special-shaped movable block (11) middle end is provided with annular groove (15) and annular protrusion (16), the position that corresponds with annular groove (15) in special-shaped square hole (9) is provided with annular protrusion (17) No. two, the position that corresponds of special-shaped square hole (9) and annular protrusion (16) is provided with annular groove (18) No. two.

4. A hip joint prosthesis according to claim 1, wherein: one end of the special-shaped movable block (11), which is far away from the second arc line surface (13) and the third arc line surface (14), is provided with a pointed cone (19).

5. A hip joint prosthesis according to claim 1, wherein: thickening cover (4) inner wall a week is provided with a plurality of fluting (20), the position that outer cup of acetabulum (1) and fluting (20) correspond is provided with a plurality of wall protruding (21), the thickness of thickening cover (4), fluting (20) and wall protruding (21) thins gradually along the lateral wall to the bottom of outer cup of acetabulum (1), the shape adaptation of fluting (20) and wall protruding (21).

6. A hip joint prosthesis according to claim 1, wherein: the acetabulum outer cup (1), the acetabulum inner liner (2) and the side wall of the thickening sleeve (4) are provided with fixing holes (22).